US Bridges

M-37 over Pine River

Fair

Wexford County, Michigan · 2 MI N of Lake CO Line · Structure no. 000000000012532

Built
1948
77 years old, rebuilt 2011
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Steel
Length
328 ft
3 main spans
Daily traffic
1,904
2007 count
Owner
State
State Highway Agency

About this bridge

M-37 over Pine River is a steel girder and floorbeam system carrying M-37 over Pine River in Wexford County, Michigan. It was built in 1948 and reconstructed in 2011, so it is 77 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,904 vehicles a day, roughly 14% of them trucks, projected to reach 2,280 by 2031. The structure is 328 ft (100.1 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-37
CrossesPine River
Location2 MI N of Lake CO Line
RouteState Highway 37
CountyWexford County
StateMichigan
Coordinates44.20434, -85.80107
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length328 ft (100.1 m)
Longest span122 ft (37.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,904 (2007)
Projected traffic2,280 by 2031
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-37 over Pine River built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2011.

What condition is M-37 over Pine River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does M-37 over Pine River carry?

About 1,904 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is M-37 over Pine River?

The structure is 328 ft (100.1 m) long with a longest span of 122 ft (37.3 m) and a deck 43 ft wide.

Who owns M-37 over Pine River?

It is owned by the State Highway Agency.